iOS 5 Sound Crash Fix

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[AVAssetReaderTrackOutput initWithTrack:outputSettings:] AVAssetReaderTrackOutput does not currently support AVNumberOfChannelsKey or AVChannelLayoutKey'
*** First throw call stack:
(0x3411b8bf 0x3213d1e5 0x37a71789 0x37a71005 0x41366d 0x412e6d 0x3698cd55 0x36997e8d 0x340ee2dd 0x340714dd 0x340713a5 0x324c6fcd 0x372c7743 0x406507 0xac45 0x8fd8):

Fixes Crash associated with the above (even though the iOS5 spec says those functions are supported they are not).
Crashes on iOS 5 only.
Devices tested: 
-iPhone 3GS (iOS 5.0.1)
-iPhone 4S (iOS 5.1)